clamp.h

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
 *
 * SPDX-License-Identifier: Apache-2.0 */
 
#pragma once
 
#include "kernel/svm/util.h"
 
CCL_NAMESPACE_BEGIN
 
/* Clamp Node */
 
ccl_device_noinline int svm_node_clamp(KernelGlobals kg,
                                       ccl_private ShaderData *sd,
                                       ccl_private float *stack,
                                       const uint value_stack_offset,
                                       const uint parameters_stack_offsets,
                                       const uint result_stack_offset,
                                       int offset)
{
  uint min_stack_offset;
  uint max_stack_offset;
  uint type;
  svm_unpack_node_uchar3(parameters_stack_offsets, &min_stack_offset, &max_stack_offset, &type);
 
  const uint4 defaults = read_node(kg, &offset);
 
  const float value = stack_load_float(stack, value_stack_offset);
  const float min = stack_load_float_default(stack, min_stack_offset, defaults.x);
  const float max = stack_load_float_default(stack, max_stack_offset, defaults.y);
 
  if (type == NODE_CLAMP_RANGE && (min > max)) {
    stack_store_float(stack, result_stack_offset, clamp(value, max, min));
  }
  else {
    stack_store_float(stack, result_stack_offset, clamp(value, min, max));
  }
  return offset;
}
 
CCL_NAMESPACE_END